TC1274 Datasheet, PDF (1/12 Pages) Microchip Technology – 3-Pin Reset Monitors for 5V Systems

M TC1272/TC1273/TC1274
3-Pin Reset Monitors for 5V Systems
Features
• Precision V_CC Monitor for 5.0V Systems
• 100 msec Minimum RESET, RESET Output
Duration
• Output Valid to V_CC = 1.2V
• V_CC Transient Immunity
• Small 3-Pin SOT-23B Package
• No External Components
Applications
• Computers
• Embedded Systems
• Battery-Powered Equipment
• Critical µP Power Supply Monitoring
Package Type
3-Pin SOT-23B*
RESET ₁
**(RESET)
V_CC 2
TC1272
TC1273
TC1274
3 GND
* 3-Pin SOT-23B is equivalent to JEDEC TO-236
**( ) is for TC1274
General Description
The TC1272/TC1273/TC1274 are cost-effective
system supervisor circuits designed to monitor V_CC in
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
The reset output is driven active within 20 µsec of V_CC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 msec after
V_CC rises above the reset threshold. The TC1274 has
an active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary out-
put, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to V_CC
= 1.2V. The TC1274 is valid down to V_CC = 1.8V. All
three devices are available in a 3-Pin SOT-23B
package.
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the V_CC line.
Typical Operating Circuit
V_CC
2
V_CC
V_CC
1
RESET
TC1272
GND
3
RESET
Input
Processor
GND
 2003 Microchip Technology Inc.
DS21382B-page 1